Light reflected off one mirror can easily be reflected again off another, and another, and another... This creates many images of a single object.

In this activity, students learn about the relationship between mirror angles and the number of images produced.

### Objectives

• Describe how light rays can change direction.

• Demonstrate how visible light is reflected.

### Key Questions

• Can you find a relationship between the angle of the mirrors and the number of images produced?
• What happens if you place the mirrors facing each other (parallel) with the happy face in between them? (This creates an endless or infinite reflection.)

### What To Do

1. Colour the happy face on the Multiple Images handout so that it’s easy to see. The happy face is the object you will be copying.
2. Place the two mirrors facing you, along the lines marked “left mirror” and “right mirror.” The two mirrors should touch at the cross marked “centre” and the right side of the right-hand mirror should be touching point A. Start recording here.
3. Look into the mirrors. Beside point A in the table, record the number of images of happy faces you see (including the one drawn on the page.)
4. Move the right mirror so that it lies along an imaginary line between the centre point and point B. Now, how many happy faces do you see? Record it in the table beside point B.
5. Repeat your observations, moving the right mirror to points C, D, E, F, and G, and taking note of how many faces you see at each angle. What do you notice?

### Extensions

• Draw a 10 cm line on a piece of paper. Put part of the line inside the mirror “book” instead of the happy face. Can you make a square? A pentagon? An octagon?
• What angle are the mirrors at to make each shape?

Survivors

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

Egg BB

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

Comet Crisp

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

T-Rex and Baby

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Buddy the T-Rex

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Geodessy

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Science Buddies

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.

Western Dinosaur

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.